$(document).ready(function(){
    $("#alert-box").click(function(){
    var a =$("input:checked").val();
    if(!a){
        alert("请选择");
    }});
    $("#reset").click(function(){
        $.post("challenge_radio.php",{"reset":1},function(){
            location.href ="challenge_radio.php";
        });
    });
    $("#start").click(function () {
        location.href = "challenge_radio.php";
    });
});
